Rotary-hook sewing-machine.



No. 780,028. PATENTED JAN. 17, 1905.

0. 1-3. FINKLE.

ROTARY HOOK SEWING MACHINE.

APPLIOATION' FILED JULY 15, 1903.

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Inventor.

Witnesses.

Attorney No. 780,028. PATENTED JAN. 1'7, 1905. G. E. PINKLE.

ROTARY HOOK SEWING MAGHINE.

APPLIUATION.IILED JULY 15, 1903.

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QRWMM Attorney- PATENTED JAN. 17, 1905.

C. B. FINKLE.

ROTARY HOOK SEWING MAUHINE.

APPLICATION FILED JULY 15. 1903. II III!!! 3 4 SHEETS-SHEET 3.

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Witnesses.

Attorney No. 780,028. PATENTED JAN. 1'7, 1905. G E. FINKLE.

ROTARY HOOK SEWING MACHINE.

APPLIOATION FILED JULY 15, 1903.

4 sHBETs-sEBET 4,.

Inventor- I} H id STT Patented J'anuary 1'7, 190 5.

PATENT OFFICE.

CHARLES E. .FINKLE, OF ROCHESTER, NEl/V YORK, ASSIGNOR OF ONE- I-IALF TO BENJAMIN H. SMITH, OF ROCHESTER, NEW YORK.

WOTfiRY Ii-IOOK SEWING IVIACHINE.

} uh SPECIFICATION o ng" p t of Letters ate No. 780,028, dated January 1'7, 1905. Application filed July 15,1903. Serial No. 165,596.

To all whom 23/? may concern:

Be it known that 1, CHARLES E. FINKLE, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Rotary-Hook Sewing- Machines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specilieation,and to the referenee characters marked thereon.

My present invention relates to improvements in sewing-machines, and more especially to that class employing a looper-hook for'looping the needle-thread in forming the stitch; and it has for its object the production of a device of this character wherein the needle is moved downwardly and slightly raised, and the loop thus formed is engaged by the looper-hook and passed over the bobbin and then released before the rising of the needle, after which the needle and tln'ead-controller complete the formation of the stitch, the result being that the loop is formed with a minimum length of thread.

Other features of novelty and advantage will be hereinafter more fully described, and pointed out in the claims hereunto annexed.

In the drawings, Figure 1 is a side elevation of a device embodying my invention. Fig. 2 is a sectional view of the same on the line 2 2, Fig. 3. Fig. 3 is an end view looking toward the right in Figs. 1 and 2. Fig. lis a plan view with the top plate removed to show'the looper and connected parts. Fig. 5 is a transverse sectional view on the line 5 5, Fig. 1, looking in the direction of the arrow; and Figs. 6, 7, 8, and 9 are diagrammatic views showing the successive positions of the parts at various stages in the formation of the loop.

The same characters of reference indicate similar parts in the several views.

In the present embodiment of my invention, 1 designates the bed-plate, supporting the arm 2 and the bearings 3 3, carrying the operating-shaft 4:, provided with the driving-wheel 5, and this wheel 5 carries a pin 6, connected by the pitman 7 to the crank 8 of the oscillating shaft 9, journaled in bearings 10 10 of the arm 2. The forward end of this shaft 9 carries a cam 11, provided with a slot 12 to receive and operate the pin or roller 13 of the needle-bar 14, and connected to this needle-bar, through the pin 15, is a tlu'ead-controller or take-up 16, which may be of any suitable construction. A presser foot 17 may also be provided, through which operates the needle 18 of the needle-bar, and below the presser-foot may be provided a feed-dog of any suitable type, the form shown comprising a bar 19, carrying the dog 20 and so mounted as to be capable of vertical and longitudinal motion in the guides 21, and beneath this bar is pivotally mounted a cam 22, having an inclined surface 23 thereon, upon which said bar rests,-1notion of said cam about its pivot causing said bar, and consequently said dog, to rise and fall in a vertical plane. Motion is imparted to said bar through the oscillating lever 24:, connected to the eccentric 25 on the operating-shaft, said lever being supported intermediate its ends by the sliding block 26, pivoted on the adjusting-bar 27, carrying the screw 27 for varying the feed to any desired degree.

In conjunction with the parts above described or their equivalents I have provided an improved looper comprising in the embodiment shown an oscillating bearded book 28, mounted on a carrier 29, journaled to rotate on the support 30, a pinion 31 being provided on the extension 32 thereof and meshing with a rack 33, slidingly mounted in the support and reciprocated by the pitman 34, connected to the crank 35 on the operatingshaft. The extension 32 of this carrier is bored centrally and fitted with the stud shaft or pin 36, provided with the bobbin-support 37 and a retaining device 38 to prevent its rotation. This bobbin-support is cut away, as at 39, for a purpose to hereinafter more fully appear, and in this support rests the bobbin 4.0 of any suitable character, a bobbinretainer 11, resting above the bobbin and pivoted at 42, being provided and normally held down upon the bobbin under the action of the spring 4-3.

The hook 28 is provided upon its lateral edges with the oppositely-arranged projecand as the bobbin-thread 6 remains relatively in the position shown in Figs. 8 and 9 it will now extend through the loop formed by the needle-thread to complete a stitch when said tions 28, which extend laterally in opposite l directions toward the sides of the bobbin, and adjacent to these lateral projections are provided the oppositely-inclined surfaces 28,

which diverge rearwardly from the point of the hook to the thread-engaging projections. Such a construction is very advantageous, for the reason that as the hook advances between the needle and its thread the loop of the loop is drawn tight in the usual manner.

The inclined surfaces 28 extending rearwardly from the point of the hook, serve the double purpose of gradually spreading the loop of the needle-thread as the hook advances until the thread has been engaged upon the 1O needle-thread is gradually expanded laterally 75 by the inclined surfaces until it is engaged projections 2 and also to release or cast off in an expanded form upon the relatively latthe loop from these projections when the hook eral projection 28, and while the loop is held reaches a predetermined position, as the rein the expanded position upon these projectreating hook will cause those portions of the 5 tions it may be readily passed over the oppoloopadjacent to the projections to be lapped 80 site sides of the bobbin, thereby reducing the around them until the inclined surfaces 28 friction of the thread to a minimum in passare reached, and at this moment the thread, ing over the bobbin and also permitting bobdirected by these inclined surfaces, will slip up bins of greater dimensions to be employed, over the projections, and thereby cast off from as will hereinafter appear. the hook. 85

Assuming that motion is transmitted to the In forming the loop in the manner hereinoperating-shaft 4:. it will be seen that withthe before described it will be observed that a parts in the position shown in Fig. 3 the pitminimum length of thread is required, as the man 7 will oscillate the shaft 9 to rock the needle remains in its lowered position from 2 5 cam 11 down, as indicated in Fig. 6, lowering the time the loop is begun or engaged by the 90 the needle into the position shown. At the hook until it has passed over the center of same time the crank and pitman 3a will the bobbin and is cast off by the book, when act on the sliding rack 33, engaging the pinthe needle begins to rise and the loop is drawn ion 31, causing a rotation of the carrier and up tight to complete the stitch. 3 the bearded hook in the direction indicated The feed mechanism, any form of which 95 by the arrow, Fig. 6. Continued operation may be employed, may be conveniently operof the parts will swing the cam 11 into the ated to engage the material being sewed by position indicated in Fig. 7, the projection 13 the cam projection 4A on the carrier engaging of the needle-bar riding up into the portion the cam-plate 22 to move it outwardly about 35 12 of the cam, raising the needle slightly, its pivot, causing the inclined surface 23 to 1 and consequently forming a loop :0 in the pass beneath and elevate the bar 19, carrying thread a of the needle. \Vhile the needle is the feed-dog 20, a spring being employed still at rest in such position, the motion of to return said plate to its normal position, the the carrier will pass the hook 28 through the location of said cam projection being such 4 loop :20 thus formed,when the crank 35,0peratthat said feed mechanism will be in operative I0 5 ing the carrier, Will reach the end of its throw position when the needle is in its raised posiin one direction. With the needle still subtion; but it will be understood, of course, that stantially at rest the carrier will reverse its while I have shown and described the present motion, retracting the hook 28, the projections embodiment in connection with one particular .45 28 of which will have engaged the loop to form of feed mechanism I do not so limit my- 119 draw it around the bobbin, and as the motion self, as any suitable mechanism for this putof said carrier progresses the portion :0 of the pose may be employed in connection with the loop will slip over the bobbin and the under looper. It will also be understood that while portion thereof will slip through the cut-away I have shown certain devices for operating :5 portion 39 and pass beneath the bobbin, said the parts of the looper and the needlel do not 5 loop remaining upon said hook until it has limit myself to such devices, as other devices passed a point diametrically opposite the may be employed for a similar purpose. needle, when the loop will be released or cast I claim as my invention off from said hook by slipping over the in- 1. In a sewing-machine, the combination clined faces 28 thereof, and the latter will be with the needle-bar carrying the needle and 20 ready for its return motion to engage and form operating means therefor, of a bobbin, a hook the next succeeding loop. In the meantime capable of an oscillatory motion about the the cam 2.1. will begin to rise and with it the bobbin having the thread-engaging projecneedle, it being understood that between the time th re n ext laterally toward the r time the hook engages the loop and releases sides of the l obbin,'ancl means for advancing 5 or casts it off the needle will remain almost the hook to enga e tljeneet lle thread upon stationary in its lowered position; but when the projections and retracting to splacl the .the loop has passed around the bobbin the loop of' the thread overthe fjobbin, L N needle is ready to rise and with it the takei a 2. In a sewing-machine, the combination (.65 16, the result being to draw ,the loop with the needle-bar carrying the needle and I 39 operating means therefor, of a bobbin, a hook capable of an oscillatory motion about the bobbin having the thread-engaging projections thereon extending laterally relatively to the bobbin, and means for advancing the hook to engage the needle-thread upon said projections to form an expanded loop, and retracting it to extend the expanded loop over the bobbin.

3. In a sewing-machine, the combination with the needle-bar carrying the needle and operating means therefor, of a bobbin, a hook capable of an oscillatory motion about the bobbin having a thread-engaging point provided with the inclined loop-spreading surfaces extending rearwardly therefrom, and the thread-engaging projections in rear of said surfaces and extending laterally relatively to the bobbin, and operating means for advancing the point of the hook between the needle and its thread until the loop of the latter is expanded by the inclined surfaces and engaged upon said projections. and thence retracting the hook until the expanded loop is extended over the bobbin and is cast off from the projections by the engagement of the thread upon the inclined surfaces of the hook.

4:. In a sewing-machine the combination with the needle-bar carrying the needle, and operating means therefor, of a hook capable of an oscillatory motion having the forwardlydirected point, the rearwardly-directed projections, and the divergent portions leading from the point to said projections for expanding the loop of the needle-thread and engaging it upon the projections, a bobbin around which the hook oscillates, and operating means for advancing the hook to engage the needlethread upon the projections, and retracting it around the bobbin until the loop of the thread engages the divergent portions adjacent the projections and thereby casts oil the loop from the latter.

5. In a sewing-machine the combination with the needle-bar carrying the needle, and the operating means therefor, of a hook capable of an oscillatory motion having a flat forwardly-directed point, the rearwardly-disposed projections formed upon the opposite edges thereof, and the rearwardly-divergent surfaces leading from the point to the said projections for expanding the loop of the needle-thread and engaging it upon the projec' tions when the hook is advanced, and for engaging the looped thread adjacent the projections to disengage the loop from the latter when the hook is retracted to a predetermined point, a bobbin around which the hook oscillates, and operating means for said hook.

6. In a sewing-machine the combination with the needle-bar and the needle carried thereby, of a hook capable of an oscillatory motion in a plane substantially at a right angle to the line of motion of the needle having a flat forwardly-directed point adapted to enter between the needle and its thread, the projections formed upon the opposite edges of the hook in rear of the point, and the rearwardly-diverging surfaces formed upon the opposite edges of the hook and leading from the point to the projections for expanding the loop of the needle-thread and engaging it upon the projections when the hook is advanced, and for engaging portions of the loop adjacent the projections and thereby casting off the loop from the latter when the hook is retracted to a predetermined point, a bobbin around which the hook oscillates, and operating means for the hook.

7. In a sewing-machine the combination with the needle-bar carrying the needle and devices for operating it in such a manner as to produce a pause or rest in its return motion and to form a loop in the needle-thread, of a curved hook capable of an oscillatory motion having a point thereon adapted to enter the loop of the needle-thread, oppositelydisposed projections in rear of the point and inclined loop-spreading surfaces adjacent the point leading to the projections for engaging both sides of the loop, a bobbin around which the hook moves, and operating devices connecting the needle-operating devices and the hook for advancing the latter to engage the loop of the needle-thread during the pause of the needle and retracting it to spreadthe thread around the bobbin before the retraction of the needle.

8. In a sewing-machine, needle-operating mechanism comprising an oscillatory shaft, a cam carried by said shaft having a slot formed therein and a projection carried by the needlebar and adapted to ride in said slot in such a manner that when said shaft is oscillated in one direction the needle-bar will be advanced to its limit of motion in one direction and then retracted to a predetermined point to produce a pause or rest in themotion of the needle, the return motion of the shaft completing the retracting or return motion of the needle-bar.

9. The combination in a sewing-machine, of a needle-bar carrying the needle, an oscillatory cam, and a projection upon said needlebar cooperating with said cam for reciprocating said needle-bar in such a manner as to produce a pause or rest in its return motion, of an oscillatory looper-hook having barbs or projections formed thereon, a bobbin around which said hook moves, and means for advancing said hook to engage the needle-th read upon said barbs, and retracting it to extend said thread around the bobbin permitting it to disengage itself from said hook to complete the formation of the loop during the pause or rest in the motion of the needle.

10. The combination with the needle-bar carrying the needle, and devices for operating it in such a manner to produce a pause or rest in its motion, of a looper-hook having a forwardly-extending point and apair of oppermit it to be released from said hook While positely-disposed rearwardly-extending barbs the needle remains substantially at rest.

or projections formed thereon adjacent said 1 point, a bobbin, and devices for advancing said CHARLES FINKLE' hook to engage the needle-thread upon the l Witnesses: barbs or projections thereof and retracting CLARENCE A; BATEMAN, it, to draw said thread around the bobbin and RUSSELL B. GRIFFITH. 

